The apartment was great, everything went super smooth. I stayed here for 3 months. Internet was superfast(500 Mbps) through ethernet cable and around 250mbps with WiFi. I have no complaints regarding the internet. The only issue I had was that there was no comfortable dedicated workspace but I set up one myself from IKEA and left behind an office chair(Matchspel), table(Lagkapten/Linnemon), and 27" extra monitor(75hz IPS). After this addition, the apartment was perfect for me.
Also, there was cheap cleaning (500THB for the whole apartment or 250THB for only the toilet) and laundry service (wowlaundry for approximately 80THB per kg for wash-dry-fold) provided which made it extra comfortable. The location was also excellent, very close to the Thonglor BTS.
The gym is open from 7 am to 10 pm
The pool is open from 7 am to 9 pm
To sum it up I was a bit scared when booking this apartment because it only had 4 reviews but I see now how this is a very rare gem. If you get a chance to book don't hesitate. This is a 5 star Airbnb and I look forward to coming back here.